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By ABC12 News Team

FLINT, MI — Two of the highest health officials in the state turned themselves into a Flint court Thursday morning.

One of them is facing involuntary manslaughter - the most serious criminal charge handed down so far in connection with the water crisis.

The charges stem from the outbreak of Legionnaires' disease in Genesee County linked to the Flint River water.

Investigators with the Attorney General's Office say Nick Lyon, the director of the Michigan Department of Health and Human Services, knew about the outbreak for a year before warning the public. He is charged with involuntary manslaughter.

The state's chief medical executive, Dr. Eden Wells, also turned herself in Thursday morning. She's charged with lying to a police officer and obstruction of justice.

Wells apparently tried to stop Wayne State University researchers from looking into the Legionnaires' problem.

Four others previously charged in this investigation are now also facing involuntary manslaughter charges - former emergency manager Darnell Earley, Flint Public Works Director Howard Croft and two DEQ higher ups.